Borovichev E.A. Botanical excursion on the Northern Soroya. Hammerfest, 2014.

Lichens on the littoral There are only a few dozen species among about 20 000 known lichens that grow always or periodically submerged by sea water. They are true halophytic and marine species which never occur outside the littoral area and are widely distributed on seashores almost everywhere in the world, hi general they belong to genus Verrucaria and are easily distinguished from free-living algae by the dark perithecia. Verrucaria striatula (dark thallus) and Verrucaria mucosa (olive-green thallus) on stones among Common Barnacles (Balanus balanoides) 91